Comparison

Viro vs Zenith Time

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Viro

Engage in unlimited AI conversations powered by clean energy. Access top AI models, create custom personas, and connect your favorite apps. Every chat supports climate initiatives.

Highlights
  • Unlimited AI chat
  • Switch between AI models
  • Create custom AI personas
  • Connect to popular apps
  • Generate images and analyze documents
  • Supports clean energy initiatives
Features
Read full description

Viro is a free AI chat app powered by clean energy. Ask anything, get answers from the world's best AI models, and help fund clean energy while you do it. No subscription required. No payment info. No data selling. WHY VIRO AI - Free unlimited AI chat — no credit card, no trial, no message caps - Switch between top AI models in a single app, mid-conversation - Create AI characters and chat with custom Personas - Connect your favorite apps — Google Drive, Calendar, Tasks, Notion, Slack, and Outlook - Generate images, search the live web, and analyze photos and documents - Every chat supports clean energy and ocean cleanup - Your conversations stay private and are never sold to advertisers WHAT YOU CAN DO Write and edit — emails, essays, cover letters, resumes, social posts Learn and study — homework help, math problems, concept explanations Translate and summarize — any language, any article, any document Create images — turn a description into original artwork Search the web — real-time answers with sources, not stale training data Ask anything — coding help, recipes, travel plans, business advice CHAT WITH PERSONAS Build your own AI characters and give them a name, a personality, and a purpose. Make a patient coding tutor, a blunt business advisor, a dungeon master, a language partner who only replies in Spanish, or a character entirely of your own invention. Save your Personas and pick up the conversation whenever you want. CONNECT YOUR FAVORITE APPS Viro works with the tools you already use. Connect Google Drive, Google Calendar, Google Tasks, Notion, Slack, and Outlook, then ask Viro to pull up a document, check your schedule, summarize a thread, or draft your next email — without leaving the chat. HOW THE CLIMATE PART ACTUALLY WORKS Most AI apps charge you $20 a month and quietly run on fossil-fueled data centers. Viro is free, supported by ads, and the profits go toward matching AI usage with renewable energy and funding climate restoration — including our support for The Ocean Cleanup. We also route every question to the most efficient model that can answer it well, instead of sending everything to the largest model available. That uses dramatically less energy for the same quality answer. And we measure it. Our energy methodology is published and built on real production data from millions of actual queries — not estimates, not marketing math. No other AI app will show you those numbers, because no other AI app wants you to see them. You don't have to change your habits or sacrifice anything. You just have to pick a different AI app. PRIVACY Your conversations belong to you. We don't sell your data, and we don't use your conversations to train AI models. Join 100,000+ people choosing AI that doesn't wreck the planet. ---------- APP PERMISSIONS Camera: capture photos to add to AI chat Photos / Media / Files: upload images and documents from your device ---------- SUPPORT Questions or feedback? Email us anytime: nick@viro.app ---------- LEGAL Terms of Use: https://www.viro.app/terms-conditions-viro-ai Privacy Policy: https://www.viro.app/privacy-policy-viro-ai

About

Zenith Time

Easily convert time zones for current and future dates across multiple cities. Solves the problem of coordinating meetings, calls, or travel across different time zones without manual calculation. Supports a wide range of cities and offers theme options for user comfort.

Highlights
  • Future date time zone conversion
  • Multiple city support
  • UTC offset badges
  • Date rollover indicators
  • Extensive city coverage
  • Dark/light themes
Features
Read full description

Zenith Time is a worldwide time zone converter with an additional feature - it allows you to convert timezones for more than just current time, but for future dates and times as well. The problem it solves: coordinating meetings, calls, or travel across multiple time zones without mental arithmetic. The user sets a base city and date/time, then adds any number of target cities — the app instantly shows the equivalent local time in each, with UTC offset badges and date-rollover indicators. If you're a remote worker, frequent traveller, or anyone who regularly communicates across time zones, this app is for you. You can convert time zones for smaller cities as well as major cities, cities listed and supported are extensive and every region is covered. Supports dark or light themes to combat eye strain on devices.

Screenshots

Viro4 screens
Zenith Time4 screens

Verdict

The call

The clearest difference is price: Viro at Free against Zenith Time's $0.99. Viro also leads on update cadence (every 8 days vs every 2 months). Zenith Time's advantage is in-app purchases (none vs 8) and review sentiment (100% vs 89%). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Viro is free to download; Zenith Time costs $0.99 up front. Viro sells 8 in-app purchases, starting at $0.99 per month. Zenith Time asks for nothing beyond the download.

UpkeepUpdate frequency

Viro ships an update every 8 days, Zenith Time every 2 months. The most recent releases landed on October 30, 2026 and October 17, 2026 respectively.

Scorecard5 real differences · 5 level
Viro versus Zenith Time: the parameters behind the verdict, then further details
ParameterViroZenith Time
PriceFree — better$0.99
Rating4.9 (293 ratings) — better—
Positive reviews89.1% of reviews100.0% of reviews — better
Number of ratings293 — better—
Update frequencyEvery 8 days — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size75 MB30 MB
Age rating4+4+
DeveloperViro Climate Action, IncSHIRIN CHAWLA

Customer experience

Viro

All ratings293 ratings
Positive96.9%
Neutral1.4%
Negative1.7%
Written reviews46 reviews
Positive89.1%
Neutral6.5%
Negative4.3%

Zenith Time

Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

8 purchases

Viro

Subscriptions8
  • Viro AI Premium (Monthly)$0.991 Month
  • Viro AI Monthly$4.991 Month
  • Viro AI Supercharged (Monthly)$9.991 Month
Show 5 more
  • Viro AI Premium (Annual)$9.991 Year
  • Viro AI Supercharged Monthly$12.991 Month
  • Viro AI Annual$49.991 Year
  • Viro AI Supercharged (Annual)$99.991 Year
  • Viro AI Supercharged Annual$129.991 Year
None

Zenith Time

No in-app purchases

Questions

Is Viro free?
Viro is free to download, with in-app purchases available.
Is Zenith Time free?
Zenith Time costs $0.99, with no in-app purchases.
Do Viro or Zenith Time have ads?
Neither Viro nor Zenith Time shows ads.
Which is updated more often, Viro or Zenith Time?
Viro ships an update every 8 days, and Zenith Time every 2 months. Most recently, Viro was updated on October 30, 2026 and Zenith Time on October 17, 2026.

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