Comparison

OneFlash vs Volvé

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

Head to head
About

OneFlash

Find nearby stations to rent portable phone chargers. Scan a QR code to unlock a battery, charge your device, and return it to any station in the network. Share power with friends and contribute to a more sustainable future.

Highlights
  • Locate nearby charging stations
  • Scan QR code to unlock battery
  • Charge multiple devices
  • Return battery to any station
  • 100% recyclable batteries
  • Flexible return policy
Read full description

How does OneFlash work? Locate the nearest OneFlash station. Scan the station's QR code to unlock a OneFlash portable battery. Grab the OneFlash battery and charge your smartphone! Performance Our 5000 mAh portable batteries can charge your phone from 20% to 100% in just one hour and can charge up to 3 smartphones. Mobility Return the OneFlash battery to any station in our network. Grab a battery in a café near Bastille metro and drop it off at a gym in République. Sharing Each OneFlash battery is equipped with 3 cables compatible with all smartphones. Charge up to 3 phones at once and share energy with your friends! Ecology OneFlash aims to reduce lithium overconsumption by offering a network of 100% recyclable rental portable batteries. We promote a sharing economy to reduce the purchase of personal external batteries. Proximity To make our rental and sharing system work for you, we've brought OneFlash to your favorite places, including shopping malls, gyms, airports, train stations, libraries, museums, and many more! Let us know where you'd like to see OneFlash stations! Accessibility We've made renting portable batteries convenient. That's why OneFlash is mostly free! To ensure availability for everyone, a €19 deposit is held but not charged. Plus, you have up to 4 days to return it. Additional Functionality At OneFlash, we think of everything. That's why we've added a micro USB port on each of our portable batteries. So, within the deposit period, you have the option to recharge the battery yourself. This gives you more flexibility and allows you to use the battery for as long as you need. Practical, right? What's New? We're always planning new features and regularly updating the app to provide you with the best OneFlash experience possible! We're Listening We're building OneFlash every day to enhance your experience. Your feedback matters! Send us your comments, suggestions, and recommendations at bonjour@oneflash.fr. P.S.: Don't forget to follow us on social media!

About

Volvé

Features
Read full description

You can’t always predict what will happen. But you can be prepared. Volvé is your personal safety net. Before you go out, you set up a plan: location, contacts, and time. If you don’t confirm you’re safe, the app automatically sends an alert with all the information to your trusted network. Ideal for: • Dates • Trips • Meetings • Night travel • Any situation where you want extra backup How it works • Set up your plan in seconds • Volvé activates a silent countdown • When you return, you enter your safe code • If you don’t, an alert is sent automatically Key features Duress code If someone forces you to cancel, you can enter a special code that triggers the alert silently. Panic button Send an immediate alert with your real-time location. Trusted contacts Your contacts receive the information via message and email. -- Your safety doesn’t depend on the situation. It depends on being prepared. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

OneFlash4 screens
Volvé4 screens

Verdict

The call

The clearest difference is in-app purchases: OneFlash at none against Volvé's 1. OneFlash also leads on iOS requirement (15.1 vs 17.0). Volvé's advantage is update cadence (daily vs every 2 weeks). On price, ads and device support 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

Both are free to download. Volvé sells 1 in-app purchase, starting at $2.99 per month. OneFlash asks for nothing beyond the download.

UpkeepUpdate frequency

OneFlash ships an update every 2 weeks, Volvé daily. The most recent releases landed on October 8, 2026 and September 20, 2026 respectively.

Scorecard3 real differences · 7 level
OneFlash versus Volvé: the parameters behind the verdict, then further details
ParameterOneFlashVolvé
PriceFreeFree
Rating3.3 (22 ratings) — better—
Positive reviews70.8% of reviews—
Number of ratings22 — better—
Update frequencyEvery 2 weeksDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size28 MB19 MB
Age rating4+4+
DeveloperOneFlashDiego Maidana

Bugs and requests

OneFlash

Reported bugs

6 issues
  • App is glitchy and unresponsive
  • Cannot change country for phone number
  • Does not send SMS confirmation code
  • Activation code not received via SMS
  • System does not detect battery return
Show 1 more
  • App proposes already reported damaged batteries

Requested features

3 requests
  • Allow email login option
  • Improve detection of battery return
  • Ensure cables are not damaged

Volvé

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

OneFlash

No in-app purchases

1 purchases

Volvé

Subscriptions1
  • Volve Premium EN$2.991 Month

Questions

Is OneFlash free?
OneFlash is free to download, with no in-app purchases.
Is Volvé free?
Volvé is free to download, with in-app purchases available.
Do OneFlash or Volvé have ads?
Neither OneFlash nor Volvé shows ads.
Which is updated more often, OneFlash or Volvé?
OneFlash ships an update every 2 weeks, and Volvé daily. Most recently, OneFlash was updated on October 8, 2026 and Volvé on September 20, 2026.

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