Learning a language sometimes seems as difficult as dieting. The solution is to figure out how to stay interested after the novelty wears off. 
 
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 To counter boredom, online language programs have introduced crossword puzzles, interactive videos and other games to reward users for making progress. 
 
 Online courses are either fee-based, free or a combination. Starter kits of fee-based programs may cost just a few hundred dollars, but the cost to reach higher levels of comprehension and speaking can easily be $1,000. 
 
 While that may sound expensive, language company executives say it isn’t; college courses often cost many thousands of dollars to reach the same level. 
 
 So, cost aside, how do you choose which program to use? The answer is that one size doesn’t fit all. 
 
 “The quality of feedback is important,” according to Mike Levy, head of the school of languages and linguistics at Griffith University in Brisbane, Australia. “Sites with human contact work best,” he said. “This shows the advantage of humans compared to computers. A computer is never as subtle or intelligent.” 
 
 PAY AND LEARN RosettaStone, the best-known language program, now offers Totale, (rosettastone.com) a $1,000 product that includes RosettaCourse, a traditional lesson-based module; RosettaStudio, a place where a user can talk to a native speaker via video chat; and RosettaWorld, an online community where you can play language-related games. 
 
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 “We offer modern-day pen pals facilitated with voice over I.P.,” said Tom Adams, the company’s chief executive. 
 
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 RosettaStone uses things like colorful flash cards to help students first learn basic words, and then connect those words to concepts and sentences. The idea, according to Mr. Adams, is for the user to let go of the adult “technical questions and just get into a comfort zone, learning new sounds and trying to make sense of them.” 
 
 One of RosettaStone’s main competitors, TellMeMore (tellmemore.com), believes it has an advantage because its software not only teaches words and phrases, but includes a speech recognition component that analyzes pronunciation, presents a graph of speech, and suggests how to perfect it. Other videos show students how to shape their mouths to create sounds difficult for native English speakers, like the rolling R in Spanish. 
 
 With 10 levels of content, a 10,000-word glossary, videos of native speakers and more than 40 practice activities, TellMeMore believes it has enough material to keep a user motivated. 
 
 TellMeMore charges $390 for a year’s access to its resources for six languages; those looking for a quick refresher can buy a $10 daily pass. Weekly, monthly and half-year passes are also available. 
 
 The company’s product is currently available only on CD-ROM, but online versions for both Mac and Windows that will include real-time coaching are coming later this year. 
 
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 FREE NOW, PAY LATER Livemocha (livemocha.com), a two-year-old Web start-up, offers free basic lessons in 30 languages. Users can upgrade to advanced courses with additional features on a monthly or six-month basis. 
 
 For $20 a month, students can submit up to eight voice recordings to a native-speaking tutor, who will then review and make recommendations for improvement within 24 hours. For $70 every six months, students can submit up to two examples a lesson. 
 
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 All students, whether using the pay or free model, can join social networking groups and speak live (using VoIP) to people around the world who are native speakers interested in learning English. 
 
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 As with all social networking sites, this feature is open to misuse. Within hours of signing up for Livemocha, I received a note from a young woman, ostensibly from Poland, “wanting to meet me.” 
 
 The company says it has “the world’s largest community of people learning languages,” with five million registered users in 200 countries. 
 
 Financed in part by the European Union, Babbel (babbel.com) offers paid instruction (and a free trial lesson) in English, French, German, Italian, and Spanish for $12 a month, or $6.62 a month for a six-month commitment. 
 
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 In addition to extended grammar and vocabulary, users can communicate with others in their desired language via private or public chats, or arrange to get in touch via voice. 
 
 FREE LANGUAGE LEARNING If money is truly an object, a variety of free language learning is available from a number of sites. 
 
 The British Broadcasting Corporation (bbc.com/languages) offers varying levels of instruction for 36 languages, with features including audio and video playback and translation. 
 
 Looking to visit Deutschland? The German television network, Deutsche Welle, can help you make yourself understood (bit.ly/ts6x7). And for those who not only want to learn another language but another alphabet as well, try japanese-online.com, or learn-korean.net. 
 
 Apps for a smartphone No program would be complete without an accompanying smartphone app, and many exist for the iPhone and other devices. 
 
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 Several are simple providers of useful phrases, including the Lonely Planet Phrasebooks ($10 for each of 18 languages), the Oxford Translator Travel Pro ($10 for each of five languages), and World Nomads (free; 23 languages). The Ultralingua Translation Dictionary ($20 a language) offers simultaneous translation of English and six languages. 
 
 Both RosettaStone and TellMeMore say that they are developing smartphone apps as supplements to their online programs, but neither has announced a release date. 
 
 Livemocha expects to have an app later this year for both the Android and iPhone operating systems. The company plans on integrating text with a native speaker pronouncing the language, and providing the option for voice recording and live video feeds. ||||| Facts, phrases and alphabets of the 20 languages most widely spoken in the world ||||| Learn on the go 
 
 We know you’re busy. That’s why Babbel lets you learn anytime, anywhere — on your desktop, smartphone or tablet. And your progress is synced across devices, so you can always pick up right where you left off. ||||| We're sorry, due to legal issues this content can not be transmitted as live stream. 
 
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– The days of chanting vocabulary words in a classroom and dozing off in the language lab are fading from memory as language instruction becomes increasingly available on the Internet. Freestanding smartphone apps are one option, and more structured instruction comes at a price—and sometimes no price at all. The New York Times looks at some of the numerous options. Pay up: Play online games, talk to "modern-day pen pals," and take advantage of speech-recognition software offered by companies such as Rosetta Stone and TellMeMore. Pay for extras: Basic access to Livemocha is free, and Babbel offers one class for no charge. Pay nothing: The BBC, the German TV network Deutsche Welle, and sites teaching the Japanese and Korean alphabets cost nada, niente, rien.