Similarity API
Ship fuzzy matching without the fuzzy pipeline
Subscription11,158 impressions#1 of its week1 comment
Comments
>log in to commentJust launched a free CSV dedupe tool at https://similarity-api.com/free-csv-dedupe
Similarity API provides a high-throughput fuzzy matching, deduplication and reconciliation API plus no-code tools for messy data.
- for
- Developers and ops teams needing scalable data matching and deduplication.
- pricing
- freemium · free trial
- license
- MIT
Key features
- High-throughput API — Process millions of records with rock-solid throughput and usable docs.
- No-code Clean tools — Five online tools (Diff, Join, etc.) deliver results in minutes without coding.
- Pay-as-you-go pricing — First 100 k rows free, then $1.99 per 10 k rows, no per-request limits.
- Secure, ephemereal data — Data is encrypted in transit and at rest and never stored permanently.
- Custom enterprise tier — Scale plan adds performance tuning, custom endpoints and premium support.
Use cases
- Clean up duplicate contacts in a CRM
- Match records across disparate systems
- Run large-scale deduplication jobs on nightly batches
- Ad-hoc data reconciliation for testing pipelines
- Provide fuzzy matching for a customer-facing search feature
Similarity API FAQ
How are rows counted?+
Each successful API call counts the number of items in the ‘data’ payload; for /reconcile both data_a and data_b are summed.
How is the Pay-as-you-go plan billed?+
You pay only for rows processed: first 100 k rows free, then $1.99 per 10 k rows.
Do I need to do anything to get the free 100,000 rows?+
No, the free rows are automatically applied when you create an account.
How secure is my data?+
Data is encrypted at rest and in transit and is never stored permanently.
What does the Scale plan include?+
It adds dedicated performance tuning, custom endpoints and premium support on top of the pay-as-you-go offering.
Summarized by DevHunt from similarity-api.com · Sep 27, 2026. Details may change; check the official site.
