Terra API
YC W21San Francisco, US · Founded 2021 · 25 employees · Hiring · 8 known investors
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Terra is an API platform that enables apps and developers in fitness, wellness, sleep, and health spaces to connect with wearable devices. The company facilitates real-time data integration from wearables to power personalized consumer experiences.
Also known as Terra · Terra API · tryterra
Founders & leadership· Y Combinator alumni (W21)
Terra API was founded in 2021 by Kyriakos Eleftheriou.
Investors · 8
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Company profile
researched Aug 2026Terra API is a health and fitness data platform that gives developers one integration point for accessing data from wearables, health apps, medical devices, sensors and blood testing providers. A single API call returns standardised data from more than 500 sources, including Garmin, Fitbit, Apple Health, Google Fit, Oura, WHOOP, Polar, Eight Sleep, Strava, Withings, Samsung Health, Cronometer, MyFitnessPal, Suunto and Wahoo, removing the need for developers to build separate authentication flows and data parsers per provider.
The platform covers more than 5,000 standardised metrics spanning activity and workouts, granular sleep stages and latency, nutrition, heart rate, HRV, VO2max, blood oxygen (SpO2), continuous glucose monitoring, menstrual cycle and body composition. Beyond raw data access, Terra provides derived health scores (recovery, strain, stress and immunity, calibrated against individual user baselines), a no-code rewards and streaks system, and a blood labs offering that includes at-home test kits, on-demand phlebotomy and delivery of lab results into the customer's app.
Developer-facing features include an embeddable, brand-customisable authentication widget that handles OAuth and token refresh, a WebSocket streaming API for real-time sensor data such as beat-by-beat heart rate, mobile SDKs (JavaScript, Python, iOS, Android), webhook delivery of normalised JSON, data deduplication, backfills, a data simulator, workout plans, team sports support, destinations, and FIT file and FHIR support. Terra states it is HIPAA compliant, GDPR compliant and SOC 2 Type II certified, with data encrypted in transit and at rest.
Founding story
The company's website states Terra was founded in 2020 by Kyriakos Eleftheriou and is a Y Combinator W21 company.
Business model
Terra sells API access to developers and enterprises on a usage-based model, charging for active users rather than per endpoint, with all data types and integrations included in each plan.
Subscription/usage-based pricing tied to the number of active users, with plans starting at $399 per month on the annual plan; enterprise inquiries are handled separately.
▸Full profile — market position, technology, go-to-market, history
Market position
Positions itself as a comprehensive health data platform and an aggregator alternative to direct wearable-vendor developer programs, serving health apps, clinical research, insurance and corporate wellness customers.
One integration replaces provider-by-provider builds: Terra abstracts OAuth, token refresh and provider-specific edge cases, returns a consistent schema across all supported sources, and ships compliance (HIPAA, GDPR, SOC 2 Type II) plus value-added layers such as health scores, rewards and blood lab logistics. It also allows access to Garmin data without requiring separate approval through the Garmin Connect Developer Program.
Technology
A unified REST API with native SDKs for JavaScript, Python, iOS and Android; an embeddable authentication widget managing provider OAuth flows and token refresh; webhook delivery of normalised JSON schemas; a WebSocket streaming API for real-time sensor data; data normalisation, deduplication, backfill and simulation tooling; FIT file and FHIR support; and derived health scoring models for recovery, strain, stress and immunity.
Go-to-market
Self-serve developer signup via a dashboard and API key with published documentation and pricing, alongside an enterprise inquiry channel and an integration-partner program; content positions Terra as an alternative to obtaining direct access to provider developer programs such as Garmin Connect.
Health and fitness app developers and engineering teams, clinical research teams, insurance companies, corporate wellness platforms and other enterprise health platforms.
History
According to the company's website, Terra was founded in 2020 by Kyriakos Eleftheriou and participated in Y Combinator's Winter 2021 batch.
Compiled by commissioned research from 1 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Competitors · 6
by search overlap
Companies competing with Terra API for the same Google search keywords, organic and paid, via search-intersection analysis.
In the news
▸Research sources · 1
primary sources listed
- Terra APItryterra.co · web
1 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Terra API do?
- Terra API offers a single API that connects apps to normalised health and fitness data from 500+ wearables, apps and devices.
- Who founded Terra API?
- Terra API was founded by Kyriakos Eleftheriou in 2021.
- Who are Terra API's investors?
- Terra API's investors include Next Ventures, Samsung Next, Y Combinator, General Catalyst, Flucas Ventures, Immeasurable, Kube VC, MVP Ventures.
- Where is Terra API headquartered?
- Terra API is headquartered in San Francisco, US.