Choosing between co-parenting websites is not like choosing a dating app. You are not looking for a date. You are looking for someone who will share a child with you, or help you conceive one, for the next twenty years. That changes what matters: how many people you can actually reach, how precisely you can filter them, and whether the platform helps you make contact instead of making you wait.
This guide compares the main co-parenting websites and sperm donor platforms available in 2026, using information that can be checked directly on each service.
Editorial disclosure: this comparison is published by CoParents.com. We have kept it to observable facts, and we say clearly where a figure comes from a platform’s own marketing rather than from something you can verify yourself.
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CoParents.com in numbers, right now
Every figure below can be checked by a visitor inside the platform itself, which is the standard we apply to every other service in this comparison:
- 165,651 profiles currently displayed in the member directory
- Over 2,800 new members in the last 30 days
- 5,208 discussions open in the community forum
- Online since 2008, which is 18 years of continuous operation
- 6 localised sites covering the US, UK, France, Germany, Italy and Spain
The 30-day figure matters more than the total. A directory can hold hundreds of thousands of records and still be dormant; a steady flow of arrivals is what tells you people are still finding the service and joining it. Very few co-parenting websites publish anything comparable.
How we compared these co-parenting websites
Most rankings of co-parenting websites simply repeat the membership numbers each company advertises. Across co-parenting websites those numbers are rarely comparable. A platform may quote registrations since launch, downloads, accounts created, or profiles currently searchable, and call all of them “members”.
We therefore separated two things:
- Claimed figures — stated in marketing material, not checkable by a visitor.
- Displayed figures — a count you can see yourself inside the member directory.
Where a platform displays a number, we say what that number represents. Where it does not, we say so rather than guessing.
Comparison of the main co-parenting websites in 2026
| Platform | Profile figure | What the figure means | Contact model | Community forum |
|---|---|---|---|---|
| CoParents.com | 165,651 — a live count | Profiles displayed in the member directory | Direct contact, no mutual match needed | Yes |
| RattleStork | 100,000+ Claimed; no total shown in member search | Registered users, stated by the platform | Direct messaging | No |
| Modamily | ≈100,000 Claimed; no total shown in member search | Community size, stated by the platform | Mutual like required | No |
| Pride Angel | 77,619 | Directory results | Direct messaging | Community content |
| Co-ParentMatch | 62,192 | Search results | Direct messaging | No |
| PollenTree | ≈36,600 | Estimated from directory pagination | Direct messaging | No |
| Just a Baby | Not disclosed | App, no public directory | Swipe and match | No |
The platforms, one by one
1. CoParents.com
Running since 2008, CoParents.com is a searchable directory rather than a swipe app. Its member search currently displays 165,651 profiles. To be precise about what that means: it is the number of profiles present and visible in the active member directory, not a historical count of everyone who ever registered.
Over 2,800 people joined in the last 30 days, so the pool keeps renewing rather than ageing. You can filter by project type (co-parent, sperm donor, woman seeking a donor), gender, age, country, town, distance and ethnicity, then narrow further to Recently Active or Newest Members so you spend your time on people who are still using the site. Contact is direct: no mutual like is required before you message someone. Two features have no clear equivalent elsewhere — Premium Contact, which delivers your profile and message by email to a member even if they are not currently subscribed, without ever revealing their address to you, and Profile Boost, a one-off purchase that lifts your profile in compatible searches with no subscription or auto-renewal.
There is also a public community forum carrying 5,208 discussions, where members put up their parenting project and talk through conception, agreements and legal questions before any profile is exchanged, plus a sperm donation resource section. The member area carries no third-party advertising.
Best for: people who want to actively search a large directory and make contact on their own terms.
2. RattleStork
Among European co-parenting websites, RattleStork is a German platform covering private sperm donation and, more recently, co-parenting, with iOS and Android apps. It advertises more than 100,000 registered users, but its directory does not display how many profiles are searchable or active, so the claim cannot be checked from the outside. Premium unlocks last-activity data, read receipts and unlimited messaging.
One caution: several of its localised comparison articles reuse the same template across countries, and the legal sections do not always match the country named in the title. Read country-specific legal claims there with care.
Best for: German-speaking users who want a mobile-first experience.
3. Modamily
Modamily offers the richest personal filters of any of these co-parenting websites — education, height, religion, political views and more, most of them behind Premium. Its communication model is the closest to a dating app: you like profiles, and messaging generally opens only once both people have liked each other. It claims a worldwide community of almost 100,000 people without displaying a searchable total.
Best for: users comfortable with a match-first model and detailed personal criteria.
4. Pride Angel
One of the older co-parenting websites, focused on LGBTQ+ family building, sperm and egg donation. Its directory displays 77,619 results, which is a directory result count rather than a statement that every profile is currently active. Search works by donor type, country and postcode.
Best for: rainbow families looking for donors or co-parents, particularly in the UK.
5. Co-ParentMatch
The most detailed traditional search form among these co-parenting websites: distance, relationship status, project, ethnic origin, religion, height, body type, blood group, profession, and an “online in the last 7 days” filter. Its search displays 62,192 results. The trade-off is that advertising appears inside parts of the member search experience.
Best for: people who want to filter on a long list of physical and personal criteria.
6. PollenTree
Unlike most co-parenting websites, PollenTree covers IVF, egg donation and adoption. It publishes no active-member total; its directory runs to roughly 3,052 pages at 12 profiles per page, giving an approximate 36,600. Treat that as an estimate — paginated directories are often capped.
Best for: users who want donation and adoption routes in one place.
7. Just a Baby
The most app-centric of the co-parenting websites reviewed here, built around swiping on distance-sorted profile cards. There is no web directory and no published user count, so its community size cannot be verified. Convenient on mobile, but you see far less of the available pool than in a searchable directory.
Best for: mobile-first users who prefer swiping to searching.
What actually matters when you compare co-parenting websites
- How many people you can really search. On many co-parenting websites the headline figure counts people who left years ago. Ask what the number represents.
- Whether you can spot active members. Recently Active, Newest Members and online status save weeks of messaging abandoned profiles.
- Whether you must wait for a mutual match. Swipe systems block contact until both sides independently like each other. A directory does not.
- What happens if the right person is not subscribed. On most platforms, nothing. This is where an email-based contact option changes the outcome.
- Whether the platform is local to you. Cross-border co-parenting adds real legal and practical complications. CoParents.com runs dedicated local sites for France, Germany, the UK, Italy and Spain alongside the international platform, so you can search close to home.
- Whether there is a community. Forums let you meet people through conversation rather than through a profile grid.
- Whether the member area is full of ads. Advertising inside a member search is a signal about how the platform makes its money.
Legal and safety points to settle first
Whichever of these co-parenting websites you use, the introduction is only the first step, because co-parenting websites are matching services and not clinics. Screening, written agreements and legal parenthood are handled outside the platform.
In the United States, two separate systems apply. The FDA regulates donated sperm and eggs as human cells and tissues, and any establishment that recovers, stores or distributes them must register with it — the agency publishes a plain-language page on what recipients should know about reproductive tissue donation. Screening and testing requirements are set out in 21 CFR Part 1271, Subpart C, and cover HIV, hepatitis B and C, syphilis, and — for donors who are not sexually intimate with the recipient — chlamydia and gonorrhea.
A donor you meet through a platform and know personally is what the regulations call a directed reproductive donor: someone donating to a specific recipient they know and are known by. That status changes which rules apply, notably the six-month quarantine and retesting requirement written for anonymous semen donors. It does not remove the case for screening — it shifts responsibility for arranging it onto you.
Legal parenthood is the separate question, and it is where the United States differs most from Europe. There is no federal framework: parentage is set state by state, and in a number of states the statutory protections that stop a donor being treated as a legal father apply only when insemination is carried out through a licensed physician. Home arrangements can therefore leave both the donor and the recipient exposed. Our guide to US sperm donor and co-parenting law covers the state-level detail, and the CDC publishes national assisted reproductive technology surveillance data if you want clinic outcomes for comparison.
Three things to do before conception, in every jurisdiction: get infectious disease and genetic screening done, put a written agreement in place covering custody, financial responsibility and decision-making, and take independent legal advice on who will be recognised as a legal parent.
Frequently asked questions
Which co-parenting website has the largest community?
Among the co-parenting websites reviewed, CoParents.com displays the largest directly visible directory count at 165,651 profiles. RattleStork and Modamily each claim close to 100,000 but do not display a searchable total, so the figures are not strictly comparable.
What does “165,651 profiles” actually mean?
It is the number of profiles currently present in the CoParents.com member directory and returned by member search. It is not a count of registrations since 2008.
How many new members join each month?
More than 2,800 people created a profile on CoParents.com in the last 30 days. You can see the flow yourself through the Newest Members view, which is the point of publishing it rather than a lifetime registration total.
How active is the CoParents.com forum?
The forum displays 5,208 discussions, spread across regional and topic groups covering the US, UK, Australia, New Zealand and worldwide conversations. That count is the number of threads, not of individual replies, and it is shown at the top of the forum. Among the co-parenting websites reviewed here, only Pride Angel offers anything comparable.
Are co-parenting websites free?
Most co-parenting websites operate on a freemium model: registration, profile creation and browsing are free, while messaging and advanced features require a subscription. Read more in our guide to finding a sperm donor online.
Do I have to match with someone before I can message them?
It depends on the platform: co-parenting websites split into two camps here. Modamily and Just a Baby are built around mutual likes. Directory-based services including CoParents.com, RattleStork, Pride Angel and Co-ParentMatch let you contact a member directly.
Can I find a donor without paying a clinic?
Yes, known donation arranged privately is possible, and our article on finding a free sperm donor explains how members organise it. Be aware that home arrangements carry medical and legal risks: FDA screening rules are written around registered establishments, and several US states only extend donor protections to insemination performed by a licensed physician.
How do I avoid inactive profiles?
Use activity filters where the co-parenting websites you shortlist offer them. Recently Active views, online status indicators and “joined recently” sorting are the fastest way to reach people who will actually reply.
Start your search
The best of the co-parenting websites for you depends on where you live, whether you want to search or swipe, and how much control you want over making contact. If you want a large searchable directory, precise filters, direct messaging without waiting for a mutual match and a community you can talk to first, CoParents.com covers all four — with 165,651 profiles, over 2,800 arrivals in the last 30 days and 18 years behind it.
Create your free profile and start searching for a co-parent or sperm donor today. You can also read how online sperm donation works before you register.
Comparison based on functionality and figures observable on each platform in August 2026. Platforms may change their features and published figures at any time.