NST research

Is a fitness smartwatch worth it?

A smartwatch may be useful if you value its features, but activity-programme research does not prove that a particular watch is worth buying. Check the exact model, compatible phone, charging needs and evidence behind the measurements you plan to use.
Research-basedReviewed by Gabriel SilvaLast verified 12 September 2026Next review due 14 March 2027Report a correction

The evidence-led answer

NST verdict

A smartwatch may be useful if you value its features, but activity-programme research does not prove that a particular watch is worth buying. Check the exact model, compatible phone, charging needs and evidence behind the measurements you plan to use.

The case for buying it

GPS, notifications or apps may be useful buying considerations if the exact model supports what you need. That is a practical preference, not a measured health benefit or proof that the device pays for itself.

The case against buying it

Do not assume a premium device improves activity more than another option. The cited studies do not settle that comparison. Check charging needs and independent validation for the exact model rather than generalising from one older watch.

Pros and cons

In favour

  • Tracker-based programmes can improve activity on average; the contribution of particular features is not established here.
  • Check whether the exact model supports the GPS, notifications and apps you want.
  • If heart-rate measurements matter to your training, look for validation relevant to the activity and model.
  • Comfort and charging requirements are practical considerations to check before buying.

Against

  • The cited research does not show which device offers the best value.
  • A small study of one older watch cannot establish accuracy for every current model or metric.
  • Battery life and charging needs require model-specific verification.
  • If tracking becomes stressful, reconsider whether the feedback is useful to you.

What this means in practice

List the features you would actually use, then check the exact model's compatibility, battery requirements and measurement evidence before spending. Consider whether you need another device at all. A watch reading is not a substitute for medical assessment.

Practical meaning

List the features you would actually use, then check the exact model's compatibility, battery requirements and measurement evidence before spending. Consider whether you need another device at all. A watch reading is not a substitute for medical assessment.

Limitations and uncertainty

The cited activity research does not establish phone, band and smartwatch equivalence or isolate individual features. The small validation study concerns one older device, not all current watches. Battery life, subscriptions and current specifications have not been verified. No hands-on test or value ranking is implied.

No product needed

This page is here to answer the question, not force a product.

Some research pages are deliberately product-free because adding a retailer link would not help the reader make a better decision. When a product is genuinely relevant, it appears after the evidence and is clearly labelled.

Evidence behind this page

What the evidence says, and where it stops.

Tracker-based programmes can increase activity

moderate confidence

The cited reviews support average activity benefits from tracker-based interventions, sometimes combined with other support. They do not isolate goals or reminders as the cause, establish the value of a particular smartwatch, or demonstrate equivalence with a phone.

Study context and sources
Who it may apply to
Adults and older adults across wearable studies.
Limitations
Interventions, populations and comparators differ. Do not infer personal benefit, feature causation or phone-versus-watch equivalence.

Device validation has model-specific limits

moderate confidence

The cited small study concerns one older wrist-heart-rate device. It cannot establish accuracy for every current smartwatch, sleep or calorie measurements, or readiness scores. Battery life, feature availability and value require separate model-specific verification.

Study context and sources
Who it may apply to
Participants using the particular older device studied; not all smartwatch users.
Limitations
One small validation study on one device. Newer models may be better. Sleep and calorie accuracy not directly tested here.

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