Fasting apps compared: what official sources document

Direct verdict

There is no single best fasting app in this comparison. The useful choice depends on whether you need a documented timer, food logging, device integrations, or a broader nutrition workflow. Zero and BodyFast have official material describing a free fasting timer. YAZIO documents optional fasting plans inside a larger food and activity product. Fastic and Simple describe broader program, food, education, or coaching features, although several basic entitlement details remain unconfirmed. Blimbi is presented through its owner-approved launch scope against those products: the reviewed record contains an owner-approved launch ledger or public store listing, so Blimbi commitments are Included at launch. That means “not confirmed” is an evidence gap, not a claim that a feature is absent.

If you already know which two products you are deciding between, the individual comparisons for Blimbi and Zero and Blimbi and YAZIO keep the same evidence boundary while making the differences easier to scan. This page is a product-information comparison, not a recommendation about fasting, weight change, safety, or medical outcomes.

Who each product may fit

Zero may fit someone looking for official documentation of a fasting timer, reminders, tracking, and Apple Watch or Google Fit support. BodyFast may fit someone who wants a documented timer with listed free features, schedules, and a separate Coach tier. YAZIO may fit a person who wants fasting options alongside a calorie diary, recipes, body metrics, activity inputs, and device connections. Fastic may fit someone interested in documented schedules, food tools, community features, challenges, and named health integrations. Simple may fit a person seeking a documented personal program, meal-plan materials, food and water tracking, and an AI coach. These are feature-fit descriptions only; they do not establish that any app is clinically appropriate or effective for an individual.

How to read the verified matrix

The verified matrix later on this page applies one field set to all six products while preserving gaps. Blimbi has owner-approved launch commitments marked Included at launch, not released-product verification. Zero and BodyFast have documented free timers; YAZIO documents optional fasting plans; Simple and Fastic document broader program or schedule material without a confirmed free timer in this record. Food tools are documented in different forms across all five released competitors, while named device or health connections are confirmed only where the listed sources support them. Price, trials, free-tier boundaries, accounts, exports, and accessibility remain unconfirmed whenever the shared record is incomplete. “Not confirmed” does not prove absence.

Important differences, data, and pricing

The products differ more in scope than in any verified outcome. Zero centers its official listings on fasting, tracking, and related health data. BodyFast separates a list of free functions from Coach features. Fastic, Simple, and YAZIO describe larger ecosystems that can include food, education, or coaching-style functions. Where a listing uses metabolic-stage language, this comparison treats it as a product description, not physiological measurement.

Privacy information also has different levels of detail. Zero, Simple, Fastic, BodyFast, and YAZIO publish privacy or store-disclosure material. Those disclosures describe categories of data processing; they are not a guarantee about every region, plan, or integration. Blimbi has no public privacy record in the reviewed material, so its data handling is Not confirmed. Read the current policy and permission prompts before entering health, fasting, food, or body information.

No durable public price is compared here. Offers, billing periods, storefronts, trials, and eligibility change, and the source report did not record a single price with enough stable context to compare fairly. Check the purchase screen before subscribing or renewing.

Method, sources, and update

This roundup uses dated official sites, store listings, help pages, terms, privacy material, and Blimbi’s local approved specification. It records features only when a reviewed source directly describes them, preserves conflicts, and excludes vendor outcome claims. Start with the more focused Blimbi versus BodyFast comparison if timer and plan controls matter most.

Verification method

Blimbi capabilities are Included at launch under an owner-approved product ledger. They remain launch commitments until release QA verifies them in a shipped app. Competitor details are limited to the dated product sources shown in the final Sources section; Not confirmed means the reviewed record does not establish a detail, not that a competitor lacks it.