umcode vs Voltage
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
umcode
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umcode turns coding into something kids can see, touch, and control. Drag colorful blocks to program real robots — no typing required. Snap your code together, hit run, and watch your robot move, sense, and respond in real time. WHAT YOU CAN BUILD • Program UCMAKE uKit & uBot robotics kits with easy drag-and-drop blocks • Control motors, RGB lights, LED matrix, ultrasonic sensors and more • Connect instantly over Bluetooth to your ESP32-powered robot POWERED BY AI • AI Vision — detect and react to the world through the camera • Pose recognition — control robots with body movements • Gesture & hand recognition — trigger actions with a wave or a sign • Train your own custom pose and gesture classifiers TWO WAYS TO CODE • Live Mode — run blocks instantly and see results as you build • Compile Mode — flash full programs so your robot runs on its own MADE FOR LEARNING • Step-by-step build tutorials and example projects • Friendly visual interface designed for young makers • Real-time variable monitoring to see how code works • Multilingual support Whether in the classroom or at home, umcode makes STEM, robotics, and AI hands-on, creative, and fun. Snap together some blocks and bring your robot to life!
Voltage
This app provides advanced diagnostics and control for specific Chevrolet and Opel electric and hybrid vehicles. It helps clear fault codes, monitor battery health, and manage vehicle functions remotely. Get detailed insights into your car's performance and avoid costly repairs.
- Clear SHVCS and BECM faults
- Monitor battery health and cell voltages
- Track usable capacity and degradation
- Remote vehicle control (start, climate)
- Deep DTC scanning and module reset
- Live parameter monitoring
- Tire rotation and charging schedule
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Clear SHVCS, and avoid the tow truck when the battery or BECM fails — the most complete diagnostic and control app for the Chevrolet Volt, Opel Ampera (Vauxhall), Chevy Bolt, Opel Ampera-e and Spark EV. Volt / Ampera: 2011-2019. Bolt / Ampera-e: 2017-2023. Spark EV: 2014-2016. HV UNLOCK — STAY ON THE ROAD A BECM or battery pack failure (P0AFA) can leave the car undrivable and waiting on a dealer. HV Unlock resets the condition so you can keep driving — the difference between getting home and calling a tow truck. The Service High Voltage Charging System (SHVCS) message is a separate problem: the car still drives normally but stops charging. Clear it to get charging working again, including enabling charging on Ampera 2012. This clears the fault condition; it is not a hardware repair. If the cause is still there, the fault can return. BATTERY HEALTH • Usable capacity in Ah, state of health, and degradation tracked over time • All 96 cell voltages live, cell delta, average and minimum cell voltage • Weak Cell active test with guided instructions and a clear verdict • NEW Capacity vs Mileage — how your pack compares with other cars at your mileage • NEW Resistance Index — internal resistance against a typical car of the same model year, flagged normal, elevated or high (supported models) • Six pack temperatures, coolant temp, heater power, conditioning mode • Module programming dates in HW Info — check whether a pack or module was replaced • Compare vehicles side by side; export, import or edit your history BOLT AND AMPERA-E OWNERS The two numbers you actually want, with no manual PID setup: usable capacity in Ah and cell-voltage spread. Track capacity over time instead of guessing from range, and check module programming dates to see whether your pack was replaced. RECENTLY ADDED • Dashboard Skin: switch the cluster between Volt and ELR designs (2016-2018 Volt and Cadillac ELR, separate purchase) • Tire rotation: write new wheel positions without a TPMS programming tool • Charging schedule with weekly departure times, and automatic stop at a chosen EV range • Module restart, oil and fuel life reset, HVAC Afterblow, engine speed control VEHICLE CONTROL Remote start and climate pre-conditioning over Bluetooth for cars before 2019, battery heater for cold-weather range, door and window operation, engine ON / OFF / Release, and remote wake to query modules without powering the car on. PROFESSIONAL DIAGNOSTICS Deep DTC scan across every discovered module, including SW-CAN. Module reset and DTC clearing. 100+ live parameters across 11 charted screens: Efficiency, Powertrain, HV Battery, HV Battery+, Cells, Charger, Charger+, Climate, 12V, 12V Power and TPMS — HV power and current, inverter voltage, MGA and MGB motor temps, transmission fluid temp, engine speed, oil and coolant temps, EGR (Gen 2), charger AC and DC voltage, current and power, HVAC temps and blower, per-module 12V supply for ECM, HPCM1/2, BECM, EBCM, EPS and ASCM, and tire pressure for all four wheels. ADAPTERS Standard ELM327 adapters cover most diagnostics and monitoring. For full functionality — SW-CAN access, HVAC and Infotainment, remote start and door unlock — use a vLinker MC / MC+ / MS or OBDLink MX+. Core diagnostics and monitoring are free. Advanced control, full live monitoring and the dashboard skin are paid upgrades. More info: https://thanxx.github.io/voltageapp
Screenshots
Verdict
The clearest difference is in-app purchases: umcode at none against Voltage's 5. umcode also leads on device support (3 vs 1) and iOS requirement (15.6 vs 18.2). Voltage's advantage is update cadence (every 5 days vs fortnightly). On price and ads 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
Both are free to download. Voltage sells 5 one-off in-app purchases. umcode asks for nothing beyond the download.
umcode ships an update fortnightly, Voltage every 5 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | umcode | Voltage |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.4 (11 ratings) — better |
| Positive reviews | — | 33.3% of reviews |
| Number of ratings | — | 11 — better |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 18.2 |
| Further details — not scored | ||
| Size | 241 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | 深圳市悠悠汇网络科技有限公司 | Oleksandr Radchenko |
In-app purchases
umcode
No in-app purchases
Voltage
- ELR / Volt Design activation$6.99
- Traffic Signs Activation (discount)$9.99
- ELR / Volt Design activation$14.99
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- Traffic Signs Activation$19.99
- Premium upgrade$24.99









