Quick answer
ConfigCat - ConfigCat wins for most builders because its free tier is no-card, includes more collaboration and governance features, and has a clearer path for growing flag-heavy teams, while Abby is better only if you specifically need A/B testing inside the same product.
How the free tiers compare
These two are both feature-flag and remote-config tools, but they optimize for different free-tier tradeoffs. Abby’s free plan is narrower and more experiment-oriented: 1,000 events per month, 1 A/B test, 3 flags or configs, and 5 environments. That makes it handy for small products that want to test one thing and keep the setup lightweight. ConfigCat’s free plan is broader for team use: no credit card required, 10 flags, 2 environments, 2 products, 2 segments, rule and rollout controls, API access, audit logs, compliance, and unlimited seats. Abby gives you an A/B testing hook that ConfigCat does not advertise here. ConfigCat gives you more room to grow before you pay, especially if your bottleneck is team access, governance, or flag management rather than experimentation.
Abby vs ConfigCat free tier, side by side
| AbbyFTV 51 | ConfigCatFTV 60 | |
|---|---|---|
| Feature flags / remote configsAbby caps the total count; ConfigCat allows more per product on the free plan. | 3 | 10 per product |
| EnvironmentsAbby offers more environments on the free tier. | 5 | 2 per product |
| ProductsConfigCat explicitly limits free usage to 2 products. | Not stated separately | 2 |
| A/B testsThis is the clearest functional advantage for Abby. | 1 | Not included |
| Events per monthAbby’s free tier is event-metered; ConfigCat’s free tier is not described this way. | 1,000 | Not stated |
| SegmentsConfigCat includes segmenting on the free plan. | Not stated | 2 per product |
| Targeting rules per feature flagConfigCat exposes more flag targeting controls in free. | Not stated | 4 |
| Percentage rollout options per feature flagConfigCat includes rollout controls in free. | Not stated | 4 |
| SeatsConfigCat explicitly allows unlimited team members. | Not stated | Unlimited |
| Credit card requiredConfigCat explicitly says no credit card is required. | Not stated | No |
After you outgrow the free tier
Abby stays flat-priced and simple: the first paid tier is Starter at $12 per project per month, then Startup at $89, with Pro and Enterprise on contact sales. ConfigCat is also flat-priced, but its paid ladder starts much higher at $110/mo for Pro, then $325, $900, and $4,500. That means Abby is cheaper for small paid usage, especially if one project fits within Starter. ConfigCat becomes more expensive sooner, but it also includes broader team and governance features. No usage-based pricing is provided for either product, so there are no per-event cost scenarios to calculate from the input.
When to pick each one
Pick Abby when…
- You want to run a small A/B test as part of your feature flag workflow.
- You only need a handful of flags or remote configs and can stay under 1,000 events per month.
- You are building with React or Next.js and want the product positioned around SSR and SSG workflows.
- You prefer a simple project-based plan and do not mind tighter caps on usage.
Pick ConfigCat when…
- You want a free plan with no credit card required.
- You need unlimited teammates on the free tier.
- You need more flag-management structure like segments, targeting rules, rollout controls, and audit logs.
- You are managing multiple products or expect to hand the tool to a larger team before paying.
- You care more about governance and collaboration than built-in A/B testing.
Bottom line
For the most common builder use case, ConfigCat is the better free-tier choice because you can start without a card, bring in unlimited teammates, and stay on free longer while you manage flags, segments, and rollout rules. Abby only pulls ahead if your immediate need is to pair feature flags with a small amount of A/B testing and you are comfortable with tighter caps. If you expect the tool to spread across a team, ConfigCat is the safer starting point.
Read the full listings: Abby and ConfigCat. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.