Comparison

Transistors Handbook vs SymCalc+

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

Head to head
About

Transistors Handbook

This app serves as a comprehensive guide to transistors, offering detailed information on over 51,000 types. Users can search for transistors by name or power, view graphical schemas, and access datasheets. It's designed to assist in selecting and designing electronic circuits.

Highlights
  • Database of over 51,000 transistors
  • Detailed transistor specifications
  • Graphical schema and code information
  • Search by name or power
  • Online datasheet access
  • Information on Silicon and Germanium transistors
Features
Read full description

Transistors Handbook - Your Transistor Guide. This app will guide you to know, choose, select and design your next board masterpiece using that transistor you weren’t remembering. With this app you can update the transistor informations and share it with other app users. What is a transistor? (from Wikipedia): “A transistor is a semiconductor device used to amplify and switch electronic signals and power. It is composed of a semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much more than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.” The transistor is the fundamental building block of modern electronic devices, and is ubiquitous in modern electronic systems. Following its release in the early 1950s the transistor revolutionized the field of electronics, and paved the way for smaller and cheaper radios, calculators, and computers, among other things.” With Transistors Handbook you will se the design, the kind and all the aspects of more than 51.000 transistors, the application will provide the following info: - Kind - Graphical Schema - Code - Type - Material - Power - VCB - VCE - VEB - LC - FT - HFE - Note of the Transistor - Similar - Online Datasheet You can also use the embedded search engine to search a transistor for its name or power. The coverage of the transistors is about the complete catalogue of the Silicon and Germanium. The series included are:, PNP and NPN, series 10 ~ 12, 14 ~ 19, 25 ~ 28, 2A ~ 2D, 2G, 2H, 2N, 2P, 2S, 2T, 30, 35, 37, 38, 3N, 3O, 3S, 3T, 40 ~ 43, 45, 4N, 50, 52, 55, 56, 5N, 60, 63, 6N, 71 ~ 74, 7N, 80, 81, 85, 90, 92, 94, A1, A5, A7, A8, AC, AD, AF, AJ ~ AM, AP, AR ~ AW, BC ~ BF, BJ, BL, BN, BP, BR ~ BV, C0 ~ C9, CA ~ CE, CG ~ CN, CP ~ CV, CX, D1 ~ D8, DA ~ DD, DH, DJ, DK, DM, DN, DP ~ DT, DW, DX, DZ, E1 ~ E3, E5 ~ E7, EA, EC, ED, EF, EJ, EL ~ EN, EQ ~ ET, EW, F1 ~ F5, FA ~ FH, FJ, FK, FM ~ FQ, FS, FT, FV, FX, FZ, G2, G6, GA ~ GF, GI, GM, GP, GS, GT, HA ~ HF, HK, HL, HN, HP, HS, HT, HV, HX, ID, IM, IN, IR, IT, J2, J4, J6, JA, JC, JE, JF, JO, K2, K4, K9, KD ~ KG, KM ~ KP, KR ~ KU, L4, L5, LB, LD, LI, LJ, LL ~ LP, LT, LX, M1, M2, MA ~ MH, MJ, MM ~ MU, MX, MZ, NA ~ NC, NJ, NK, NM, NP, NR ~ NT, NX, NZ, OC, OD, P2 ~ P4, P6, P7, P9, PB ~ PE, PH ~ PO, PR ~ PU, PX, PZ, Q, Q5, R3, R5, R7 ~ R9, RC, RE, RJ, RS, RT, RV, S0 ~ S2, S4 ~ S9, SA, SC ~ SH, SK, SM, SN, SP, SQ, SS, ST, SV, SX, SY, T0 ~ T3, TA, TB, TD ~ TF, TI, TK ~ TN, TP, TR, TS, TV, U2, UC, UM, UN, UP, V1, V2, V4, V7, W2, WT, XA ~ XC, XP, XQ, XS, ZB, ZD, ZG, ZH, ZT, ZU, ZX, with volts, frequencies, power, HFE (gain), similar transistors and pin design. The list may not be exhaustive, if you find any transistor missing, let us know. *** Don't forget to check also our Mosfet Handbook application. The perfect companion of Transistors Handbook.

About

SymCalc+

This app provides advanced mathematical calculations, from basic arithmetic to university-level topics. It combines the functionality of a scientific graphing calculator with the ease of a mobile application, offering symbolic computation and detailed feature explanations.

Highlights
  • Exact arithmetic and numerical modes
  • Symbolic algebra and calculus operations
  • Matrix operations and linear algebra
  • Equation and differential equation solvers
  • Complex number arithmetic
  • Interactive graphing
  • Session management and PDF export
Features
Read full description

Solve equations, simplify algebra, take derivatives and integrals, work with matrices, and visualize results in 2D and 3D from one app. Whether you need an exact symbolic answer, a decimal approximation, or a graph, SymCalc keeps the full workflow in one place. Store your work in reusable sessions, assign variables, define your own functions, and come back to your calculations later. - Solve single equations and systems with exact or numerical results - Simplify, factor, expand, substitute, and find roots, limits, sums, products, and Taylor series - Handle calculus tasks including derivatives, indefinite and definite integrals, and differential equations - Work with matrices and vectors: determinants, inverses, rank, RREF, eigenvalues, eigenvectors, dot products, and cross products - Graph standard functions, implicit equations and inequalities, polar curves, parametric plots, and 3D surfaces - Use logarithmic axes, inspect intersections, and adjust extra variables with sliders - Compute with complex numbers and common scientific functions - Save worksheets, keep multiple sessions, create custom functions, and export your work as PDF or SymCalc files - Learn faster with built-in function help and examples inside the app - Built for students, engineers, scientists, and anyone who needs more than a basic scientific calculator

Screenshots

Transistors Handbook4 screens
SymCalc+4 screens

Verdict

The call

The clearest difference is review sentiment: SymCalc+ at 74% against Transistors Handbook's 27%. SymCalc+ also leads on rating (4.7 vs 3.9) and ratings volume (91 vs 24). Transistors Handbook's advantage is price ($3.99 vs $9.99) and update cadence (fortnightly vs every 5 weeks). On ads, in-app purchases, monetization model 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

Transistors Handbook costs $3.99 and SymCalc+ $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SymCalc+ holds the better App Store score, 4.7 against 3.9. Both are backed by a comparable volume of ratings — 24 and 91 respectively. Written reviews point the same way: 27% of Transistors Handbook's written reviews are positive against 74% of SymCalc+'s.

UpkeepUpdate frequency

Transistors Handbook ships an update fortnightly, SymCalc+ every 5 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
Transistors Handbook versus SymCalc+: the parameters behind the verdict, then further details
ParameterTransistors HandbookSymCalc+
Price$3.99 — better$9.99
Rating3.9 (24 ratings)4.7 (91 ratings) — better
Positive reviews27.3% of reviews73.7% of reviews — better
Number of ratings2491 — better
Update frequencyFortnightly — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.4 — better13.0
Further details — not scored
Size22 MB46 MB
Age rating4+4+
DeveloperCentro Studi Informatica di Danilo PrioreVoxeloid Kft.

Customer experience

Transistors Handbook

All ratings22 ratings
Positive68.2%
Neutral9.1%
Negative22.7%
Written reviews11 reviews
Positive27.3%
Neutral27.3%
Negative45.5%

SymCalc+

All ratings91 ratings
Positive91.2%
Neutral4.4%
Negative4.4%
Written reviews19 reviews
Positive73.7%
Neutral21.1%
Negative5.3%

In-app purchases

None

Transistors Handbook

No in-app purchases

None

SymCalc+

No in-app purchases

Questions

Is Transistors Handbook free?
Transistors Handbook costs $3.99, with no in-app purchases.
Is SymCalc+ free?
SymCalc+ costs $9.99, with no in-app purchases.
Which has better reviews, Transistors Handbook or SymCalc+?
SymCalc+ is rated higher. Transistors Handbook averages 3.9 out of 5 from 24 ratings, while SymCalc+ averages 4.7 from 91 ratings.
Do Transistors Handbook or SymCalc+ have ads?
Neither Transistors Handbook nor SymCalc+ shows ads.
Which is updated more often, Transistors Handbook or SymCalc+?
Transistors Handbook ships an update fortnightly, and SymCalc+ every 5 weeks. Most recently, Transistors Handbook was updated on November 1, 2026 and SymCalc+ on November 3, 2026.

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