Sahha vs Terra

Terra reaches more devices. Sahha reaches more people.

Terra connects server-side to roughly 90 named integrations, more direct cloud coverage than almost anyone. Its scores return null without the physiological inputs a wearable supplies, so a phone-only user arrives as data with no score attached. Sahha scores that user from the phone alone, alongside 800+ devices.

Choose Sahha if

  • Your users include people who own no wearable
  • You want to segment users by behaviour, not only score them
  • You want scoring and a BAA without an Enterprise contract
  • You want a flat bill rather than metered credits

Choose Terra if

  • Your users span many wearable brands and you ship no app
  • You need live in-session streaming during workouts
  • You need clinical lab panels or test ordering
  • You want data written straight into S3, Postgres or Kafka
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Coverage

Who each one can return a score for.

Both read Apple Health and Health Connect, so both collect from a phone. The difference is what comes back when the phone is all a user has.

Sahha

82–97%

Smartphone ownership across surveyed markets. Sleep, activity and mental wellbeing all compute from phone signal alone, and any devices a user already owns add detail on top.

Terra

13–46%

Wearable ownership across surveyed markets. Terra ingests phone data without complaint, but its own documentation states scores return null without their specific physiological inputs, and several need a 7 to 30 day baseline before they compute at all.

Worth checking against your own base. Terra will collect from a phone-only user quite happily. It just will not score them, and an unscored profile looks identical to a broken integration from inside your dashboard.

Terra score inputs
Output

Two different stacks, not one longer one.

Terra normalises metrics from roughly 90 named integrations and adds a Health Scores layer. Above that it goes clinical, with a lab-reports layer and test ordering Sahha has no equivalent for, both set out further down this page. Sahha goes the other way, into behaviour. No archetype, tag or insight library appears in Terra documentation as of August 2026.

Terra docs
Terra
Normalized metrics Roughly 90 integrations, cloud and OS store
Health Scores Listed from +$499/month
Archetypes Not documented
Tags Not documented
Insights Not documented
Sahha
Granular data Raw sensor logs, included
Biomarkers 100+ across six categories
Scores Five, all working phone-only
Archetypes 14 archetypes, 100+ values
Tags Writable, 75+ symptom and reproductive terms
Insights Trends and comparisons
Price

Scoring is a line item, not a tier.

Terra Quick Start is a data plan. Its scoring, its lab biomarkers and its streaming are each priced separately on top. Sahha's scores, biomarkers, archetypes, tags and insights are on every plan, including the free trial.

A team that needs scoring Terra Sahha
Base plan $499 $399
Scoring From +$499 Included
Behavioural biomarkers and archetypes Not offered Included
Evaluate before paying Money-back guarantee 30-day free trial
Monthly, with scoring From $998 $399

Monthly list price on both sides. Billed annually the base plans are $399 and $299. Terra's pricing page lists Health Scores as a Quick Start add-on from $499, while its documentation describes scores arriving in the data payload without mentioning a surcharge, so confirm which applies to your contract. Clinical lab biomarkers are a separate Terra product, covered further down. Their credit model is genuinely cheaper than a flat tier where few of your users ever connect a device, since it bills connections rather than people. That is worth knowing, and it is also the case this page turns on: those users keep sending phone data to both platforms, and only one of them returns a score for it.

Terra pricing
Validation

Validated by what, exactly.

Terra does publish research, including a Nature Portfolio paper, and it would be wrong to imply otherwise. The narrower question is what sits behind the scores you would be buying: the marketing describes them as validated without naming the study, the sample or the method, so the claim cannot be checked from outside.

Sahha publishes the study underneath its models with sample size, ethics approval and limitations stated, and runs the same models on every deployment, so a score means the same thing in your product as in anyone else.

2,068
participants
26,888
PHQ-9 responses
21/074
Otago ethics approval
Read the research Terra health scores
Limitations

What Sahha does not do.

No clinical lab panels
Sahha biomarkers are behavioural and physiological, not clinical. Terra standardises over 4,100 lab biomarkers through its Lab Reports API, roughly 1,900 of them mapped to LOINC. If lab values have to sit alongside wearable data in one schema, that is a real reason to choose them.
No test ordering
Sahha reads signal a user already generates rather than ordering anything new. Terra Vantage orders blood and DNA kits and returns FHIR, in the UK and USA. A diagnostics workflow needs that from somewhere, and it will not be from us.
No live streaming
Sahha delivers over webhooks and REST, which is the wrong shape for a live session. Terra streams sub-second over BLE and ANT+ and ships a WearOS SDK. If your product is a workout screen updating in real time, that is their category and we are not in it.
Far fewer direct cloud connections
Terra lists roughly 90 named integrations, most of them server-side connections to a wearable cloud. Sahha has four: Oura, WHOOP, Garmin and Dexcom. Everything else reaches Sahha through Apple Health or Health Connect, which needs your app on the device. For a product spread across many wearable brands with no app to ship, Terra is the better fit and it is not close.
Switching

What switching from Terra actually costs

The honest version, including the part that is genuinely painful. Nothing here requires a cutover date or a frozen roadmap.

  1. Terra live
    Sahha live
    new signups → Sahha
    No cutover date

    Run both at once

    Add the Sahha SDK alongside your Terra integration and point new signups at Sahha. Nothing is switched off, and if a contract still has months to run this is usually cheaper than an early exit.

  2. A

    Allow “your app”

    Sleep
    Activity
    Connect
    Once at most

    Re-consent depends on who owns the connection

    When a user connects a wearable, that permission belongs to whoever registered the connection. Sahha uses accounts you create and own, so connections you already hold move across and your users do nothing. Where your current vendor owns them, users approve once more, into an account that is then yours. Phone data is unaffected either way: Apple Health and Health Connect grant it to your app, not to the code inside it.

  3. Sleep · last 30 days backfilled
    30d ago today
    Automatic

    Migrated users arrive with history

    Up to 30 days is retrieved the moment a user connects, so personalization keeps working through the switch instead of cold-starting every migrated user.

  4. # one webhook consumer POST /sahha/webhook { "profileId": …, "scores": […] }
    One handler

    Map one payload, not each provider

    Both platforms normalize into their own schema, so this is a remapping job rather than a parsing one. Existing Terra destinations keep receiving data until you retire them.

Evidence

Line by line.

The checks that rarely decide a comparison but always come up before signing.

Criterion Sahha Terra
How many sources are there really? 800+ devices through Apple HealthKit and Health Connect, plus four direct cloud connections: Oura, WHOOP, Garmin and Dexcom. 500+ on their homepage, 300+ on their AI product page, and roughly 90 named in their supported-integrations reference. They do not publish what the 500+ counts. Terra integrations reference
Does it cover my mobile stack? iOS, Android, Flutter, React Native, Expo and Ionic/Capacitor, each with its own installation guide. Native iOS, Android, React Native and Flutter, plus WearOS for streaming only. Their JavaScript SDK is deprecated. Terra SDK docs
How much history arrives at signup? 30 days, included on every plan and on by default. Provider-dependent, with no single published window. Health Connect is capped at 30 days, and not before the moment permission was granted. Terra backfill docs
Can I get FHIR-formatted output? No. Sahha returns its own schema over webhooks and REST. Yes. FHIR output is supported, and a hosted MCP server provides LLM access. Terra FHIR docs
Can I write straight into my own datastore? No. Delivery is webhooks and REST, and you land the data yourself. Yes. S3, Google Cloud Storage, Azure Blob, Postgres, MySQL, Supabase, MongoDB, Firestore, SQS and Kafka. Terra data destinations
What am I actually billed on? A flat monthly price for a user allowance. A user with three wearables costs the same as a user with none. Credits. An active authentication costs 200 per month against 100,000 included, so roughly 500 connections rather than 500 users. Events beyond the first 400 per user cost 0.5 each, and overage runs $0.005 per credit up to 1M, then $0.003. Terra pricing
Can I evaluate before paying? Yes. Free for 30 days, 25 users, all features. No. $399/mo billed annually, with a 30-day money-back guarantee. Terra pricing
How do I get a signed BAA? From the Pro tier, at a published $1,499/mo. No sales call. A signed BAA is listed as an Enterprise inclusion. It is not listed on the Quick Start plan. Terra pricing

Every Terra claim links to their own documentation. Verified 2026-07-26.

FAQ

Sahha vs Terra, answered

Is Sahha cheaper than Terra?

At entry level yes, and the gap widens with scoring. Sahha Starter is $299/mo billed annually for 1,000 users with every feature included. Terra Quick Start is $399/mo billed annually and lists Health Scores as an add-on from $499/mo, so from $898/mo for the same job, covering roughly 500 active authentications on their published credit rates. Sahha is free for 30 days with nothing paid up front; Terra’s equivalent is a 30-day money-back guarantee, which means paying $399 first and asking for it back. Both figures are from the vendors’ own pricing pages, retrieved July 2026.

Does Terra support Apple Health and Health Connect?

Yes. Terra’s Mobile SDK connects Apple Health, Samsung Health, and Google Fit or Health Connect, and Terra documents these as the only integrations the Mobile SDK is used for. So a mobile SDK reading the phone health stores is not a Sahha-only capability. The difference is emphasis: for Terra it is one path among many, and for Sahha it is the collection model.

Can Sahha work without a wearable?

Yes. Sleep, activity and mental wellbeing all score from smartphone signal alone, with mental wellbeing carrying full factor coverage from the phone, and biomarkers include values inferred from phone sensors rather than read from a device. Terra’s scores require inputs like HRV, resting heart rate, respiratory rate, SpO2 or sleep stages, and their documentation states none computes from step count alone.

Which one should I use for a clinical or regulated product?

It depends on which part is regulated. Terra offers FHIR output, lab biomarker standardisation with LOINC codes, and test-kit ordering through Vantage, none of which Sahha has. Sahha offers DPA and BAA from its Pro tier, where Terra lists a signed BAA as an Enterprise inclusion. If you need clinical lab interoperability, Terra. If you need behavioural signal with a BAA below enterprise pricing, Sahha.

Can I use both?

Yes, and some teams do. The architectures are complementary rather than overlapping: Terra for direct wearable cloud connections and clinical lab data, Sahha for phone-derived behavioural and mental health signal. The cost question is whether two vendors is worth it versus accepting one set of gaps.

Keep comparing

Same research standard, same sourcing. See all comparisons .

All Terra information on this page reflects publicly available documentation as of July 2026, linked at the point of each claim. Product details change. If something here is out of date or inaccurate, email support@sahha.ai and we will correct it. Trademarks are the property of their respective owners. Sahha is not affiliated with, endorsed by, or sponsored by Terra.

Compare them on your own data.

Point it at your own users and see what comes back, including the ones who own no wearable.

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