Comparison

VHDL Ref vs Language Reference for Xojo

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

Head to head
About

VHDL Ref

This app serves as a quick reference for VHDL and Verilog, two popular Hardware Description Languages. It offers a searchable dictionary of keywords, operators, and data types, along with examples and common functions for each language. Designed for engineers and students, it facilitates cross-language comparison and filtering by language elements.

Highlights
  • Searchable dictionary of keywords, operators, and data types
  • Examples for every reference construct
  • Common functions for VHDL and Verilog
  • Pre-defined attributes for VHDL
  • Primitive gates and drive strengths for Verilog
  • Filter by language (VHDL, Verilog, or both)
  • Filter by language elements
Features
Read full description

The pocket translator for hardware description languages. VHDL Ref is a quick reference for VHDL, Verilog, and SystemVerilog, written by engineers for engineers. For every construct in VHDL it shows the equivalent in Verilog, and vice versa. Whether you are an FPGA or ASIC designer who thinks in one language but has to read the other, a verification engineer working in SystemVerilog, or an engineering student in your first digital design course, VHDL Ref puts the answer one tap away. + 328 entries covering every keyword, operator, and data type in both languages + Cross-language equivalents on every entry: see how the other language says it + A simple worked example for every single entry + SystemVerilog coverage, plus VHDL 2008 and Verilog 2001 notation + All pre-defined VHDL attributes + All Verilog primitive gates and drive strengths + Filter by language and by element type + Works completely offline: in the lab, on a plane, behind the firewall + No ads, no subscription, no account, no tracking Native on iPhone, iPad, and Mac (a real Mac app, not a port), so the same reference sits next to your simulator at your desk and rides in your pocket everywhere else. Note: VHDL Ref is a reference, not a simulator or compiler. It is the book you keep open beside your tools, rebuilt for the device you always have with you.

About

Language Reference for Xojo

Access comprehensive Xojo language documentation offline on your iPhone and iPad. This app provides instant access to the full language reference, ideal for developers who need quick lookups without an internet connection. Keep your primary development device free while you consult the documentation.

Highlights
  • Offline Xojo language documentation
  • Accessible on iPhone and iPad
  • No internet dependency
  • Ideal for secondary screen use
  • Updated for Xojo 2019r2.1
Features
Read full description

Language Reference for Xojo is the full documentation for the the Xojo language now available on iPhone and iPad. This app brings the full language reference to the tip of your fingers with no dependencies to the Internet. You can now browse the Xojo language reference on a secondary screen leaving your desktop device fully available for development. Updated for Xojo 2019r2.1

Screenshots

VHDL Ref3 screens
Language Reference for Xojo4 screens

Verdict

The call

The clearest difference is price: Language Reference for Xojo at Free against VHDL Ref's $2.99. Language Reference for Xojo also leads on review sentiment (88% vs 44%) and rating (4.8 vs 3.2). On 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

Language Reference for Xojo is free to download; VHDL Ref costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Language Reference for Xojo holds the better App Store score, 4.8 against 3.2. Both are backed by a comparable volume of ratings — 5 and 18 respectively. Written reviews point the same way: 44% of VHDL Ref's written reviews are positive against 88% of Language Reference for Xojo's.

UpkeepUpdate frequency

VHDL Ref ships an update every 7 months, Language Reference for Xojo every 3 months. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.

Scorecard7 real differences · 3 level
VHDL Ref versus Language Reference for Xojo: the parameters behind the verdict, then further details
ParameterVHDL RefLanguage Reference for Xojo
Price$2.99Free — better
Rating3.2 (5 ratings)4.8 (18 ratings) — better
Positive reviews44.4% of reviews87.5% of reviews — better
Number of ratings518 — better
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.611.0 — better
Further details — not scored
Size1 MB46 MB
Age rating4+4+
DevelopersquishLogicJeremie Leroy

Customer experience

VHDL Ref

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews9 reviews
Positive44.4%
Neutral22.2%
Negative33.3%

Language Reference for Xojo

All ratings18 ratings
Positive94.4%
Neutral5.6%
Negative0.0%
Written reviews8 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

In-app purchases

None

VHDL Ref

No in-app purchases

None

Language Reference for Xojo

No in-app purchases

Questions

Is VHDL Ref free?
VHDL Ref costs $2.99, with no in-app purchases.
Is Language Reference for Xojo free?
Language Reference for Xojo is free to download, with no in-app purchases.
Which has better reviews, VHDL Ref or Language Reference for Xojo?
Language Reference for Xojo is rated higher. VHDL Ref averages 3.2 out of 5 from 5 ratings, while Language Reference for Xojo averages 4.8 from 18 ratings.
Do VHDL Ref or Language Reference for Xojo have ads?
Neither VHDL Ref nor Language Reference for Xojo shows ads.
Which is updated more often, VHDL Ref or Language Reference for Xojo?
VHDL Ref ships an update every 7 months, and Language Reference for Xojo every 3 months. Most recently, VHDL Ref was updated on September 25, 2026 and Language Reference for Xojo on October 8, 2026.

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