Aceto vs Sky Engine
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Aceto
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Meet aceto The aceto app is your personal fat-burning companion. Paired with the aceto Go breath acetone meter, it turns the fat-burning signals (acetone) in your breath into daily trends. We make your body management visible so you can go the distance. [Real-Time Fat Burn Measurement] Just take a breath, and the app instantly displays your current fat-burning level. From "not yet started" to "high-speed fat burn," your status is clear at a glance. [Integrated Diet Logging] Track your daily food choices and compare them with changes in your breath acetone. See exactly "which meal boosts your fat burn, and which one slows it down." [Multi-Dimensional Data Tracking] Consolidate your daily weight, body fat, and acetone data. Overlay acetone charts with weight, body fat, fasting, and water intake. Review the trajectory of your bodily changes to discover your unique metabolism rhythm. [Fasting & Water Tracker] Set your eating and fasting windows to help your body build a regular metabolic rhythm. Log your daily water intake and set remindersβlet every sip of water fuel your metabolism. *This app requires the aceto Go breath acetone meter hardware to function. *This product is not a medical device and is intended for health management and monitoring purposes only. *For any health-related decisions, please consult your physician or professional medical personnel.
Sky Engine
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You already know what's bothering you. You just haven't found the words yet. Sky Engine is a clarity journal that guides you from mental fog to a concrete next step β in a single session. No blank pages. No pressure. Just a structured path through what's heavy, with AI-powered reflection that sounds like a coach, not a chatbot. HOW IT WORKS Each session moves through three short steps: Fog β Name what feels unclear, heavy, or hard to articulate. Prompts help you start if you're stuck. Threads β Pull apart what's underneath. Identify what's really going on beneath the surface. Next Step β Get a concrete, doable action framed as a micro-experiment you can try today. At the end, you receive a Clarity Card β a distilled summary of your session with a Sky Line (a one-sentence insight), your core tension, what matters most, and a recommended step forward. YOUR SKYFRAME As you build a reflection practice, your Skyframe evolves. It starts as a dim vessel and grows through five tiers β Sparked Core, Fragment Return, Constellation Alignment, all the way to Sky-Forged Brilliance β with visual changes that reflect your real progress. Collect 60 clarity artifacts, equip one of five Realms that give you passive bonuses, and grow four familiars that travel with you. It's a quiet reward system for showing up. KOI POND CALM MODE Before a session, or whenever you need to settle, drop into the Koi Pond. Toss food to the fish and watch them swim toward it. Throw pebbles and listen to the plop. Breathe with the 4-4-6-2 box rhythm. Tap through an EFT tapping sequence. Or just let the ambient stream sound run in the background. It's a small, gentle space that asks nothing of you. BUILT FOR REAL LIFE β’ Works fully offline β your data stays local by default β’ Sign in with Apple to back up and restore your history across devices β’ Dark mode and light mode β’ No subscriptions, no ads, no streaks you have to protect Sky Engine isn't a habit tracker or a mood diary. It's a place to come when something feels stuck β and leave with a little more clarity than when you arrived.
Screenshots
Verdict
Aceto and Sky Engine are too close to call on the numbers: across 6 compared parameters β price, update cadence, ads and in-app purchases among them β neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Aceto ships an update weekly, Sky Engine every 5 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.
| Parameter | Aceto | Sky Engine |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 5 days β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 β better | 15.1 |
| Further details β not scored | ||
| Size | 37 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Fitz Inc. | Chase Your Sky LLC |
In-app purchases
Aceto
No in-app purchases
Sky Engine
No in-app purchases
Questions
Is Aceto free?
Is Sky Engine free?
Do Aceto or Sky Engine have ads?
Which is updated more often, Aceto or Sky Engine?
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