Comparison

convertX vs ThemeDay

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

Head to head
About

convertX

Features
Read full description

ConvertX gives engineers, students, and everyday users the most complete unit converter in their pocket. 44 categories. 400+ units. Offline. EVERYDAY — FREE FOREVER Length · Weight · Temperature · Area · Volume · Speed · Time Data Storage · Pressure · Energy · Power · Angle · Fuel · Frequency LIVE CURRENCY 30 currencies updated in real-time. Works offline with cached rates. No account. No sign-up. Just convert. ENGINEERING SUITE — PRO The only converter with a complete professional engineering toolkit: Mechanical: Force · Torque · Stress · Density · Dynamic Viscosity Kinematic Viscosity · Acceleration · Angular Velocity Civil: Flow Rate · Stress Intensity · Illuminance · Concentration Water Hardness Electrical: Voltage · Resistance · Capacitance · Inductance Current Density Thermal / HVAC: Thermal Conductivity · Heat Flux · Cooling Load Specific Heat Science: Radiation Dose · Radioactivity · Molar Amount Acoustics: Sound Level · Luminous Intensity Material Science: Hardness (HRC / HV / HB / Shore) · Elastic Modulus DESIGNED FOR REAL USE • 48-point bold numbers — your result fills the screen • Dark neon UI — no eye strain in the field or lab • Tap any unit row to set it as your conversion target • Swap units with one tap — no fumbling • Copy result to clipboard instantly • Favorites — pin your most-used converters to the top • History — last 50 conversions saved automatically • 100% offline — no internet needed for any unit conversion PRIVACY FIRST No account. No tracking. No personal data collected. PRO — $4.99 ONCE, YOURS FOREVER Unlock all 29 engineering categories with a single one-time purchase. No subscription. No monthly fee. Lifetime access including all future engineering categories added to the app. ConvertX is the converter engineers reach for on-site, students use in the lab, and travellers rely on for currency — all in one place.

About

ThemeDay

Features
Read full description

Dress your iPhone for every special moment. ThemeDay automatically switches your wallpaper, lock screen, and widgets at midnight on birthdays, anniversaries, festivals, and 60+ other special occasions, then restores your default the next day. Set it up once. Your iPhone does the rest. HOW IT WORKS: Add your special dates - birthday, anniversary, Diwali, Christmas, graduation, and more ThemeDay sets up an automatic midnight switch on your phone On the special day, your iPhone wakes up with a themed wallpaper The next day, your default wallpaper is restored No daily effort. No manual changes. 65+ OCCASION THEMES: Personal: Birthdays, wedding day, personal milestones Romance: Valentine's Day, anniversary, engagement, propose day, rose day, hug day, kiss day Family: Mother's Day, Father's Day, baby shower, Raksha Bandhan, pet birthdays Indian Festivals: Diwali, Holi, Eid, Navratri, Onam, Ganesh Chaturthi, Dussehra, Baisakhi Western Festivals: Christmas, Halloween, Easter, Thanksgiving, New Year's Eve, St. Patrick's Day, Hanukkah, 4th of July Achievements: Graduation, promotion, new job, house warming, retirement Social: Friendship Day, Women's Day, World Environment Day, Pride Day, Teacher's Day FEATURES: Automatic wallpaper switch at midnight Home screen and lock screen themed together WidgetKit widgets with countdown and greetings Day-before reminder notification App icon changes based on occasion Auto restore to default wallpaper Preview themes before applying Import birthdays from Contacts Import events from Calendar THEMEDAY PRO: No ads Unlimited saved occasions (free version: 5) AI Wallpaper Generator Custom Theme Builder Multiple theme variants iCloud sync Extended theme duration All plans auto-renew. Cancel anytime in App Store settings. Payment is charged to your Apple ID account at confirmation of purchase. Subscription renews automatically unless canceled at least 24 hours before the end of the current period. Privacy Policy: https://sites.google.com/view/privacytermsconditionthemeday/home Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

convertX4 screens
ThemeDay4 screens

Verdict

The call

The clearest difference is iOS requirement: convertX at 13.0 against ThemeDay's 17.0. On price, ads, in-app purchases 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. convertX sells 1 one-off in-app purchase and ThemeDay sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 5 level
convertX versus ThemeDay: the parameters behind the verdict, then further details
ParameterconvertXThemeDay
PriceFreeFree
Update frequency—Fortnightly
AdsYesYes
In-app purchasesYesYes
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better17.0
Further details — not scored
Size32 MB128 MB
Age rating17+9+
DeveloperDhaval PanasaraAPP TEAM

In-app purchases

1 purchases

convertX

One-time1
  • LifeTime Premium$4.99
3 purchases

ThemeDay

Subscriptions3
  • Weekly$1.997 Days
  • Monthly$6.991 Month
  • Yearly$29.991 Year

Questions

Is convertX free?
convertX is free to download, with in-app purchases available.
Is ThemeDay free?
ThemeDay is free to download, with in-app purchases available.
Do convertX or ThemeDay have ads?
Both convertX and ThemeDay show ads.

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