Rest vs Stellar Sleep: Which CBT-I App Is Right for You?

If you're weighing Rest against Stellar Sleep, you've probably been at this a while: the sleep hygiene advice, maybe a supplement or two, and still that familiar 3am arithmetic about how much of the night is left. What you want now is the one that actually works, without losing another month finding out.

Here's the short version. Both are built on cognitive behavioral therapy for insomnia (CBT-I), the approach sleep medicine recommends ahead of medication for chronic insomnia [1], and you can start either one today without going through a professional first. The difference is how you're carried through it: Rest gives you an AI coach that teaches, adapts, and checks in daily, while Stellar Sleep is a guided program you work through on your own.

Full disclosure: we build Rest, so weigh that. We've tried to give Stellar Sleep a fair read below.

Rest vs Stellar Sleep, Compared

Both draw on CBT-I and both are generally available rather than prescribed. The difference is daily adaptive coaching against a guided self-paced program, and what each one costs.

(Pricing, listing, and program details accessed July 2026 and may change.)

How They Actually Differ

• Rest's free tier covers most of what Stellar charges for. That's a bold claim from the company that makes Rest, so here is the detail to check it against: free Rest gives you the full education library, the sleep-restriction schedule and the algorithm that personalizes it, the relaxation audio, and the nightly sleep log, in English or Spanish, with no expiry. Set that beside Stellar's paid program and the overlap is most of it. The AI coach is what you pay Rest for, and Rest has a 30-day money-back guarantee if it isn't for you. Stellar has no free tier: you price the first week yourself between $0.99 and $18.37, with $18.37 the option they point you to, and then it's $188 a month [3].

  
  

• One thing sits behind Rest's subscription, and it's the part nobody else has. Rest is the first fully AI-led program built on the behavioral principles of CBT-I. The coach teaches you the material as you go, works out which of your habits is keeping you awake and talks you through changing it, and remembers what it learns about you, so its suggestions get better fitted to your schedule, your preferences, and what you'll realistically do. It checks in every day, which is the accountability a human coach gives you. That's the paid feature, and it's why the program runs differently from anything else here.

  
  

• Follow-through. Neither app gives you a live human coach, and both ask for roughly ten minutes a day. Stellar's answer to the drop-off problem is gamification: an owl mascot, badges, and animals you unlock by logging your sleep. That is a real attempt at a real problem, and some people respond well to it. Rest's answer is a daily conversation, typed or out loud, with a coach that remembers where you left off, which is a different kind of pull. With CBT-I it's finishing that makes the difference, not starting.

  
  

• Who's behind the sleep science. Rest was developed with Dr. Ashley Mason, PhD, at the University of California, San Francisco, and another collaborator is Dr. Elaine Blank, PhD, a clinical psychologist specializing in CBT-I at Stanford's Sleep Health and Insomnia Program. Two of Rest's scientific advisors trained directly under Richard Bootzin, who developed stimulus control, and a third was mentored by a longtime collaborator of Charles Morin at Université Laval. Stellar says its curriculum was “developed with sleep experts” but doesn't name them, and it has a clinical study underway funded by the US Department of Commerce [3].

  
  

• Platform and language. Stellar Sleep runs on both iOS and Android; Rest is iPhone-only for now, so Android users can't use it yet. Rest runs in English and Spanish, while Stellar's App Store listing lists English only [2].

So Which One Should You Pick?

For most people, Rest is the stronger choice, and the price is the blunt part of it. Stellar is $188 a month. That is nearly five times Rest's $39.95, and before paying for either one, Rest's free tier covers most of the same ground for nothing.

Stellar Sleep is a genuine choice in one situation: you're on Android, where Rest isn't available yet. That is a real gap on Rest's side rather than a technicality.

The other reason people give, wanting a fixed self-paced program with no check-ins, is where the price gets hardest to defend, because that is close to what Rest's free tier already is: the education, the sleep-restriction schedule, the relaxation audio, and no coach unless you choose to pay for one. Paying $188 a month for a self-paced program is a difficult case to make when a free one covers most of the same ground. For everyone else, start with the free tier and see whether the program suits you before paying anything.

For a wider view of the options, see The Best CBT-I Apps (2026).

See how Rest works and start today »

(Rest is a program built on the principles of CBT-I. It does not diagnose or treat insomnia and is not a substitute for medical care. Features and pricing for other products are current as of July 2026 and may change.)

Citations

1. *Edinger, J. D., Arnedt, J. T., Bertisch, S. M., et al. (2021). Behavioral and psychological treatments for chronic insomnia disorder in adults: An American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine, 17(2), 255–262. *https://doi.org/10.5664/jcsm.8986

2. Apple App Store listings: Rest (id 1609977097) and Stellar Sleep: Insomnia CBT (id 1602312365), language support as listed, accessed July 2026.

3. Stellar Sleep. Program description, techniques, and origin (a venture at Harvard Innovation Labs, 2021) from stellarsleep.com. The “developed with sleep experts” wording, the ongoing clinical study funded by the US Department of Commerce, and the reported outcome figures are from stellarsleep.com/science; those figures are the company's own and are not described as independently verified. Pricing observed in the company's own web checkout on 30 July 2026: a 7-day trial priced by the customer at $0.99, $3, $9, or $18.37, then a recurring $188 a month (the payment page states “$188.00 / month after”), with a 30-day full-refund guarantee.